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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9852127cf21af6e412d4865e4e0a9b6eef2f01f0583d9261810ebd617d7210b' 
  AND token = '40rnoT7FX6dp3ApOpXXB+Dewm3xuNLfwHzAQ2N5FzZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}